Rotary valve type magnetic foreign matter remover

ABSTRACT

A rotary valve allowing a rotor to be stored rotatably in a tubular powder granular material feeding chamber in a casing, storing and feeding powder granular material received from a powder granular material feed port to the troughs of the rotor, and discharging the powder granular material from a powder granular material discharge port to the outside, wherein an inspection hole having an openable inspection door is provided in the casing, a magnetic foreign matter attracting member formed of a plurality of magnets is installed in the troughs so as to allow to rotate integrally with the rotor, magnetic foreign matter mixed in the powder granular material is attracted to the magnetic foreign matter attracting members, and the said inspection door is opened to allow the magnetic foreign matter to be removed.

TECHNICAL FIELD

The present invention relates to a rotary valve type magnetic foreignmatter removal device that separates and removes magnetic foreign mattermixed in powder granular material.

PRIOR ART

As a prior art, Japanese published unexamined utility model applicationNo. H1-99444 teaches an iron removal device removing iron impurities oriron powder mixed in powder granular material. The device comprises acylindrical body that powder granular material is passed through, and aplurality of bar magnets that are arranged around an axis perpendicularto a length direction of the body inside the cylindrical body withrunning parallel to the axis, wherein a plurality of bar magnets rotatesaround the axis integrally. Several bar magnets are arranged in adirection perpendicular to a direction that powder granular materialfalls, by arranging the iron removal device in an appointed place of apipe. Because the magnets rotates at a regular speed around the axis,falling powder granular material is dispersed and touches top and bottomof the magnet at least twice, the magnets efficiently attracts a verysmall amount of iron powder etc. that was hard to remove in old-typedevice. There is no fear that the pipe is clogged with overlapped powdergranular material because the bar magnets are not lattice type asold-type device and always rotates. When an interval of the bar magnetsis large, powder granular material is hard to come to touch the barmagnets. On the contrary, when an interval of the bar magnets is toosmall, the pipe is clogged up if the fluidity of the powder granularmaterial is bad. It is necessary to arrange the magnets at appropriateintervals.

However, in this prior art device there is a disadvantage thatadsorption rate is worse because the falling powder granular materialcontacts with the bar magnets at very few times, and is dispersed withscattering by the bar magnet rotation. For example, in flour millingfactories that a ceiling is high and a slant degree of laying pipe islarge, a removal rate is low because a powder granular material fallingfrom height of 10 m to 20 m touches the bar magnet in a moment.Increasing the removal efficiency of the iron matter is expected.Because there is no function except for removing iron in the ironremoval device, a space for removing iron use only is necessary.Further, because a dead space is needed for falling powder granularmaterial, miniaturization of the whole device is difficult, and there isa problem that the powder granular material stuck into the dead spacemay be spoiled and contamination may be produced.

An object of the present invention is to provide a rotary valve typemagnetic foreign matter removal device, which a separation removal rateof the magnetic foreign matter mixed in the powder granular material isimproved, a pneumatic-conveyance function or an air locker function isadded besides the magnetic foreign matter removal, the size reduction ofthe whole device is attained.

DISCLOSURE OF THE INVENTION

In view of these various problems, the invention described a rotaryvalve type magnetic foreign matter removal device comprising: a rotaryvalve allowing a rotor to be stored rotatably in a tubular powdergranular material feeding chamber in a casing, storing and feedingpowder granular material received from a powder granular material feedport to a trough of the rotor, and discharging the powder granularmaterial from a powder granular material discharge port to the outside,and having an inspection door that opens and closes an inspection holeprovided in the casing, a magnetic foreign matter attracting memberhaving a plurality of magnets that is installed in the trough of therotor, and rotating integrally with the rotor, wherein magnetic foreignmatter mixed in the powder granular material are attached to themagnetic foreign matter attracting member, wherein the inspection dooris opened to allow the magnetic foreign matter attached to the magneticforeign matter attracting member to be removed. The rotary valve with afeed port and a discharge port in the upper direction and the lowerdirection is preferable, but either the one in the right and leftdirection or the one in the axis direction may be used. The magneticforeign matter attracting member can be installed in the rotor or afixable member that can be fixed to the rotor. As a magnetic foreignmatter attracting member, the one that attracts directly it by themagnets is suitable, and also the one that attracts indirectly it bymagnetic covered with non-magnetic cover is suitable. When theinspection door is opened, it is preferable that both of the rotor andthe magnetic foreign matters attracting member or magnetic foreignmatters attracting member alone can be took out. It is used as themagnetic foreign matters attracting member, for example cylinder shape,plate shape, spherical shape, oval shape, and elliptical shape, etc. Themagnetic foreign matter attracting member may be installed at thedirections such as parallel direction, vertical direction, slantdirection to a spindle line direction of the rotor.

The invention described an embodiment of a rotary valve type magneticforeign matter removal device comprising: a casing allowing a powdergranular material feed port and a powder granular material dischargeport to be installed in an upper direction and a lower direction, andhaving a powder granular material feeding chamber being connected to thepowder granular material feed port and the powder granular materialdischarge port, an axis installed rotatably in the casing, a rotor fixedto the axis and allowing the powder granular material feeding chamber todefine so as to form a plurality of the troughs by having a plurality ofblades extending radially, magnetic foreign matter attracting memberhaving a plurality of magnets that are installed to go through thetroughs in a direction of the axis and rotateing integrally with therotor and the axis, a drive side plate having a drive side bearing thatprops up rotatably the axis, a follower side plate having an inspectionhole, an inspection door opening and closing the inspection hole,wherein the powder granular material is poured from the powder granularmaterial feed port into the troughs, the magnetic foreign matter mixedin the powder granular material are attached to the magnetic foreignmatter attracting member with rotating the rotor, the powder granularmaterial is discharged from the powder granular material discharge port.Thereby the above-mentioned object is accomplished effectively.

The invention described a rotary valve type magnetic foreign matterremoval device, wherein a magnet foreign matter attracting membercomprising: fixable plates fixed to the rotor to rotate integrally withthe rotor relative to the casing, non-magnetized or a very littlemagnetized cylindrical covers fixed to the fixable plates or attached tothe fixable plates with detachability, allowing the magnets to be putinto or put out. Thereby the above-mentioned object is accomplishedeffectively and the collection of the magnetic foreign matters isperformed easily.

The invention described a rotary valve type magnetic foreign matterremoval device, wherein the magnets are attached to the rotor withdetachability. Thereby the above-mentioned object is accomplishedeffectively and the collection of the magnetic foreign matters isperformed easily.

The invention described a rotary valve type magnetic foreign matterremoval device, wherein the magnets are bar magnets. Thereby theabove-mentioned object is accomplished effectively and which makesmaintenance etc. easier.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a partial broken front view of a rotary valve type magneticforeign matter removal device according to an embodiment of the presentinvention.

FIG. 2 is a plan view of a rotary valve type magnetic foreign matterremoval device according to an embodiment of the present invention.

FIG. 3 is a bottom plan view of a rotary valve type magnetic foreignmatter removal device according to an embodiment of the presentinvention.

FIG. 4 is a left side elevation view of a rotary valve type magneticforeign matter removal device according to an embodiment of the presentinvention.

FIG. 5 (a) is a sectional view taken on the line X—X in FIG. 1.

FIG. 5 (b) is a partial enlarged sectional view of the magnet and thenon-magnetized cover.

FIG. 6 is a right side elevation view of a rotary valve type magneticforeign matter removal device according to an embodiment of the presentinvention.

FIG. 7 is a sectional view taken on the line VII—VII in FIG. 4.

FIG. 8 is a left side elevation view of an opened inspection door.

FIG. 9 is an explanatory elevation view showing the state that themagnetic foreign matters are attracted by the magnets.

FIG. 10( a) and FIG. 10( b) are sectional views of modified modes ofrotary valve type magnetic foreign matter removal devices.

BEST MODES OF CARRYING OUT THE INVENTION

A rotary valve type magnetic foreign matter removal device 1 in apreferred embodiment of the present invention is described below withreference to FIGS. 1 through 10. As shown in FIGS. 1 through 6, therotary valve type magnetic foreign matter removal device 1 includes apair of surface plates 2 that the shape looks like a tile with an arcsurface 2 a (refer to FIG. 5) on the center portion of the inner wallwith the outer surface wall being cut like a crystal glass, a drive sideplate 3 whose end is fixed to a power supplying side of a pair ofsurface plates 2 so as to connect each other orthogonally by bolts 3 a(refer to FIG. 6) and having a center through hole 30 (refer to FIG. 7),a power receiving side plate 4 whose end is fixed to a follower side ofa pair of surface plates 2 so as to connect each other orthogonally bybolts 4 a (refer to FIG. 4) and having a big diameter inspection hole 40(refer to FIG. 8), a powder granular material feeding chamber 6 (referto FIG. 5) enclosed by a body casing 5 made of light metals which iscomposed of the surface plate 2, a drive side plate 3, a follower sideplate 4, and an inspection door 20 that will be described later, an axis7 (Refer to FIG. 5,7) made of a stainless steel which is orthogonallyinstalled to the drive side plate 3 and the follower side plate 4 so asto be supported rotatably at one end and a rotor 8 (Refer to FIG. 5)fixed to the axis 7. The axis 7 has a bearing in one end when theinspection door 20 is opened, while the inspection door 20 is closed andthe rotor 8 rotates.

As shown in FIG. 2, the rotary valve type magnetic foreign matterremoval device 1 includes a square powder material feed port 9 (refer toFIG. 5) and a square powder material discharge port 10 (refer to FIG.5). The powder material feed port 9 and the powder material dischargeport 10 are installed in the upper portion and the lower portion, whichare connected to a powder granular material feeding chamber 6. Thepowder material feed port 9 is formed with an opening in an uppersurface of the rotary valve type magnetic foreign matter removal device1. A feed port connection surface 11 is formed so as to connect to anabove side powder material processing device (not shown) in an uppersurface of the surface plate 2, a plurality of screw holes 12 for theattachment of the device are formed. On the other hand, as shown in FIG.3, the powder material discharge port 10 is formed with an opening in abottom surface of the rotary valve type magnetic foreign matter removaldevice 1. Wherein the inputted powder material from the powder materialfeed port 9 is transported by the rotation of the rotor 8 to the powdermaterial discharge port 10. A discharge port connection surface 13 isformed so as to connect to a below side powder material processingdevice (not shown), a plurality of screw holes 14 for the attachment ofa powder processing device are formed.

In addition, taking a side view, as shown in FIG. 5, the rotor 8includes a tubular potion 15, a plurality of plate type blades 16 thatspread radially from outer diameter side of the tubular potion 15. Therotor 8 divides the powder material feeding chamber 6 so as to form thetroughs 17 (called pockets, hollow portions, etc.). As for the clearancebetween the rotor 8 and inner wall of the surface plate 2, a suitableinterval is set according to a use. For example, when the rotor is usedfor an air lock purpose, the interval is maintained generally with highprecision of equal to or less than 0.12 mm (0.10 mm through 0.06 mm forexample, 0.07 mm through 0.08 mm in particular). Thereby a difference inpressure is maintained by preventing a leak of air in a place withdifference in pressure between upper and lower direction such as thepowder material feed port and the powder material discharge port and theair lock is performed suitably. The axis 7 is inserted into a hollowportion 80 of the tubular portion 15 and is fixed, as shown in FIG. 5,the axis 7 and the rotor 8 can rotates integrally in an arrow Adirection by driving force of a motor 50 (refer to FIGS. 1 through 3).Thus, the inputted powder material from the powder material feed port 9is transported by the rotation of the rotor 8 so as to take in thetrough 17, is discharged from the powder material discharge port 10 tothe below side. As for the shape of the tip of the blade 16 there are anormal type and an edge type generally, in this case, an edge 18 cutdiagonally to rotary direction of the rotor 8 is adopted in order tonon-wearing out and to enhance a supply efficiency.

As shown in FIGS. 2 through 8, a magnetic foreign matter attractingmember 25 through 28 are arranged in the body casing 5. The magneticforeign matter attracting member is composed of a non-magnetism cover25, a magnet 26 (a permanent magnet is preferable), a side fixationplate 27 and a ring 28. One set of the non-magnetism cover 25, magnet 26and ring 28 are each arranged in all of trough 17. Magnet 26 ofdesignated shape (in this case, cylinder shape) is fitted into a hollowportion of the tubular non-magnetism cover 25 arranged with a horizontaldirection (a spindle line direction of axis 7). The non-magnetism cover25 is made of stainless steel, aluminum, aluminum alloy, hard plastic,etc. and includes a substance without magnetism or a substance with weakmagnetism. The magnet 26 is composed of a substance with strongmagnetism, for example, such as a substance with max 13000G in themagnet-surface magnetic flux density. It is possible that a magneticforeign matter M which is a minute one or made of a weak thing ofmagnetism such as iron powder, a piece of iron (refer to FIG. 9), areattracted strongly on the surface of the non-magnetism cover 25 bymagnetism of magnet 26. A pair of side fixation disk plates 27 are eachfixed on the side of both ends of rotor 8 in a vertically direction (aradius direction of axis 7) so as to allow to rotate integrally with therotor 8. An end part of the non-magnetism cover 25 is attached to theone side (the left) of the side fixation plate 27 detachably, andanother end of the non-magnetism cover 25 is fitted in a hole of theother side of the side fixation plate 27 and is fixed. The ring 28 isset around the non-magnetism cover 25 movably, so that the removal workof the magnetic foreign matters becomes easily by the moving of the ringto right and left directions. The magnet 26 can be attached detachablyto the side fixation plate 27 by a screw 29. The non-magnetism cover 25and the magnet 26 are installed inside of the trough 17, an upwardposition in the trough is more desirable, and also are arranged in anaxis direction of the axis 7. It is the reason to put on and off easilyand to improve the removal efficiency of the magnetic foreign matter M.When one magnet 26 is installed in the trough 17, the magnet is arrangedpreferably in the center part or the upper part of the trough 17, andspecially preferably in the upper and center part of the trough. If themagnet is arranged at much lower part, there is a fear that an upperpowder material P in the trough 17 may not touch the non-magnetism cover25.

When the magnetic foreign matters are attracted to the surface of thenon-magnetism cover 25 by magnetism of the magnets 26 and accumulated,it is necessary to remove the magnetic foreign matter M regularly inorder to avoid a lowering of removal efficiency. In addition, it isnecessary to enable internal check, cleaning, disassembly of the rotaryvalve type magnetic foreign matter removal device 1, in order todissolve the trouble of contamination (pollution by spoiled material)caused by the powder material such as foods, medicines, etc. and topromote hygiene security. Therefore the inspection door 20 is connectedwith the follower side plate 4 by hinge 21 with open-ability, and acover back part 22 (refer to FIGS. 2 through 3) with a taper portion 22a is fitted to the inspection hole 40 in the follower side plate 4(refer to FIG. 7). The hinge 21 includes a follower side projection 212with an oval hole 211 formed in vertically direction (refer to FIG. 1),a hinge pin 213 inserted to the oval hole 211 movably in front and back,and a connection portion 215 linked up with the hinge pin 213 and fixedto the inspection door 20 by a screw 214. The inspection door 20 has aplurality of attachment holes 23 (refer to FIG. 8 right side), and knobvolts 24 (refer to FIG. 4) can be attached so as to put in screw holes42 (refer to FIG. 8 left side) in the predetermined portion of thefollower side plate 4.

The axis 7 is formed in demension of enabling to fit in a hollow portion80 (refer to FIG. 7), a concave portion 81 is formed in about radialdirection in hollow central area of the axis end portion of the rotor 8with a very small circumference wall 82 remained. The almost parts of anaxis end 70 are fitted to a concave portion 81 with detachability. Theaxis end 70 is used to fix the rotor 8 to the axis 7 with detachability,and is fixed to the axis 7 and the rotor 8 by screw.

As shown in FIG. 7, a plurality of attachment holes 73 are formed in thecircumference location of the axis end 70, bolts 74 are attached so asto insert into screw holes 75 of the rotor 8. An attachment hole 76 isformed in the center portion of the axis end 70, wherein bolts 77 areinserted into a screw hole 78 which is formed in a center portion of theend of the axis 7. A parallel key 79 of the axis 7 is fitted in a grooveof the rotor 8 so as to prevent skidding, transmits the rotation driveof the axis 7 to the rotor 8.

On the other hand, as shown in FIGS. 1 and 7, a drive side bearing 33 isarranged in inner wall of the through hole 30 of the drive side plate 3.In addition, a ring 31 for seal made by Teflon, a ring-shaped seal part32 (an oil seal in this embodiment), a drive side bearing 33 that issingle line deep groove ball bearing, are arranged in drive edgeoutsider lap sides of the axis 7. The drive side bearing 33 is fixed bya bearing stop 34. A motor rotating axis fixable hole 99 extends overdetermined length in the center of the right-side end of the axis 7,wherein a drive axis of the motor 50 is fitted and connected. A axiscover 51 of the motor 50 is connected with a cover 35 of the drive sideplate 3 by volts 36. A connection line box 52 is provided with the motor50 (refer to FIGS. 1 through 3).

According to the rotary valve type magnetic foreign matter removaldevice 1 mentioned above, while the device is running, the axis 7rotates integrally with the magnetic foreign matters attracting member25 through 28. As shown in FIG. 9, the powder granular material P fed tothe powder granular material feed port 9 is poured toward the trough 17and is stored in the trough with rotation, the trough becomes a closedspace because of the edge 18 contacting with the arc surface 2 a. Thereis a time to move a semicircle together with the magnet 26, with takingin the powder granular material P within the trough 17. While the powdergranular material P moves the semicircle, the magnetic foreign matter Mis attracted to the surface of the non-magnetism cover 25 by themagnetic field works being produced from the magnets 26. Because thepowder granular material P poured to the powder material discharge port10 does not receive influence of the magnets 26 in the powder materialdischarge port 10, the powder granular material P is separated from thenon-magnetism cover 25 by gravitation. The powder granular material P isdischarged below from the powder material discharge port 10. On theother hand, the magnetic foreign matter M continues to rotate with beingattracted to the surface of the non-magnetism cover 25.

As shown in two pointed chain-lines of FIG. 2 and FIG. 3, when theinspection door 20 is opened for inside inspection by taking the knobvolt off, only one side of the axis 7 is supported by the motor 50 andthe drive side bearing 33. After the volt 77 is took off, the rotor 8,the magnets 26, the fixation plate 27 and the ring 28 are detached fromthe axis 7 can be put out through the inspection hole 40. Therebycollection of magnetic foreign matter M, inside-inspection, and cleaningare performed with ease. The screw 29 is took off, if it is necessary,the magnets 26 are excluded so as to pull out from the non-magnetismcover 25, the ring 28 are moved on the circumference of thenon-magnetism cover 25. Thereby the ring 28 can brush off the magneticforeign matter M, the magnetic foreign matters M are corrected easily.After the inspection is over, the inspection door 20 is closed in thereverse manner of the mentioned procedure and is fixed to the followerside plate 4 by the knob volt 24. The axis 7 is supported at the one endand the device is assembled again. Also, the both ends bearing structurethat a bearing is installed in the inspection door 20 may be preferable.

FIG. 10 (a) show a modified mode of the rotary valve type magneticforeign matter removal device 1, a pair of non-magnetism cover 25′ andmagnet 26′ are arranged in each trough 17. FIG. 10 (b) show a furthermodified mode of the rotary valve type magnetic foreign matter removaldevice 1, three of non-magnetism cover 25″ and magnet 26″ are arrangedin each trough 17. These shapes, number, arrangement position can beadopted appropriately in the range that a removal effect of the magneticforeign matter M is maintained.

According to the rotary valve type magnetic foreign matter removaldevice 1 mentioned above, the trough 17 is able to rotate a half in astatic state (the state that stayed) with enclosing the falling powdergranular material P. Also, because the powder granular material P withinthe trough has enough time to come close to the non-magnetism cover 25and the magnet 26, the magnetic foreign matter can be attracted withhigh efficiency.

In addition, the ministry space and energy saving are realized because apneumatic-conveyance of powder granular material P and removal of themagnetic foreign matter M can be performed simultaneously. Further, as arotary valve, the high removal efficiency of the magnetic foreign matterM prevents the magnetic foreign matter M to be caught between the rotor8 and the arc surface 2 a. In particular, when this rotary valve isapplied to air lock that demands a precision clearance, it has anadvantage. In an application example to the powder granular materialtransportation, when iron impurities were sieved and removed by asieving process (a sifter etc.), the rest iron impurities as themagnetic foreign matter M is removed by the rotary valve type magneticforeign matter removal device 1. Of course, when the rotary valve typemagnetic foreign matter removal device 1 is used in a front step of thesieving process, it is prevented effectively that the magnetic foreignmatter M are caught to the blade 16.

Further, after the powder granular material P is stored in the trough17, on the way to moving inside the powder granular material feedingchamber 6 the magnetic foreign matter is magnetically captured by themagnets 26. Thereby dead space decreases and size reduction of wholedevice is realized. Because the blade 16 plays a scraper and preventsthe powder granular material sticking to a lap inside of the powdergranular material feeding chamber 6, the blade 16 prevents effectivelycontamination. Because there is hardly dead space, the contaminationcaused by the powder granular material P can be prevented. Thereby anexcellent sanitation is offered.

When the inspection door 20 is opened and the magnetic foreign matter Mis removed, because the ring 28 hangs and brushes off the magneticforeign matter M, it is easy to collect the magnetic foreign matter M.In addition, as the inspection door 20 can be opened and shut at will,the magnetic foreign matter M can be correct and control easily, so thisdevice is suitable to the processing device for foods, medicines etc.which is demanded to has sanitary nature in particular.

Magnetism of the magnet 26 is hard to disperse, by utilizing nonferrousmaterial such as an aluminum material, stainless steel etc. to the bodycasing 5.

This invention should not be confined to the embodiments described, andcan be added changes to in the range that does not depart from technicalthought of the present invention. The invention is intended to cover allmodifications, equivalents and alternative falling within the spirit andscope of the invention as defined by the appended claims. For example,the structure that the magnetic foreign matter M is attracted directlywith the magnet 26 and the magnet 26 with the magnetic foreign matter Mis removed may be adopted.

INDUSTRIAL APPLICABILITY

According to the invention of the claims, a separation removal rate ofthe magnetic foreign matters mixed between powder granular material isimproved, a pneumatic-conveyance function or an air locker function isadded besides the magnetic foreign matter removal, the size reduction ofthe whole device is attained.

1. A rotary valve type magnetic foreign matter removal devicecomprising: a rotary valve allowing a rotor to be stored rotatably in atubular powder granular material feeding chamber in a casing, storingand feeding powder granular material received from a powder granularmaterial feed port to said trough of said rotor, and discharging saidpowder granular material from a powder granular material discharge portto the outside, and having an inspection door that opens and closes aninspection hole provided in a side surface of said casing; and amagnetic foreign matter attracting member which includes: fixable platesthat are attached to both sides of said rotor, a plurality of barmagnets fixed or connected to said fixable plates with detachability andarranged in each of a plurality of troughs of said rotor to allow saidarrangements to rotate integrally with said rotor, and non-magnetized orvery little magnetized cylindrical covers covering said bar magnets tobe put into or put out, wherein said bar magnets and said covers areconnected to said fixable plates such that said powder granular materialstored in said troughs surround and contact with said covers, whereinmagnetic foreign matter mixed in said powder granular material areattached to said magnetic foreign matter attracting member, wherein saidinspection door is opened to allow said magnetic foreign matter attachedto said magnetic foreign matter attracting member to be removed, whereinsaid rotor, bar magnets, covers and fixable plates rotate integrallywith said axis, and wherein said inspection door is opened and saidrotor, bar magnets, covers and fixable plates are detached from saidaxis and are put out through said inspection hole.
 2. A rotary valvetype magnetic foreign matter removal device comprising: a casingallowing a powder granular material feed port and a powder granularmaterial discharge port to be installed in an upper direction and alower direction, and having a powder granular material feeding chamberbeing connected to said powder granular material feed port and saidpowder granular material discharge port; an axis installed rotatably insaid casing; a rotor fixed to said axis and defining said powdergranular material feeding chamber to form a plurality of troughs byhaving a plurality of blades extending radially; a magnetic foreignmatter attracting member which includes: a plurality of fixable platesthat are attached to both sides of said rotor, a plurality of barmagnets connected to said fixable plates with detachability and arrangedin each said troughs of said rotor to allow said bar magnets to rotateintegrally with said rotor, and non-magnetized or very little magnetizedcylindrical covers covering said bar magnets to be put into or put out,wherein said bar magnets and said covers are connected to said fixableplates such that said powder granular material stored in said troughssurround and contact with said covers; a drive side plate having a driveside bearing that rotatably disposes said axis; a follower side platehaving an inspection hole; and an inspection door that opens and closessaid inspection hole, wherein said powder granular material is pouredfrom said powder granular material feed port into said troughs, saidmagnetic foreign matter mixed in said powder granular material areattached to said magnetic foreign matter attracting member with rotatingsaid rotor, said powder granular material is discharged from said powdergranular material discharge port, wherein said rotor, bar magnets,covers and fixable plates rotate integrally with said axis, and whereinsaid inspection door is opened and said rotor, bar magnets, covers andfixable plates are detached from said axis and are put out through saidinspection hole.
 3. The rotary valve type magnetic foreign matterremoval device according to claim 1, wherein said bar magnets and saidcovers are arranged in a center part of an upper part of said trough. 4.The rotary valve type magnetic foreign matter removal device accordingto claim 3, wherein said bar magnets and said covers are arranged in anupper and center part of said trough.